The role of intra-NAPL diffusion on mass transfer from multi-component NAPLs subjected to persulfate

Saeid Shafieiyoun, Neil R. Thomson

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Quantitative Remediation

ABSTRACT: An experimental and computational study was performed to investigate the role of multi-component intra-NAPL (non-aqueous phase liquid) diffusion on the formation of an interfacial layer which can restrict mass transfer processes from complex multi-component NAPLs subjected to water or chemical oxidants. The results indicated that a combination of NAPL composition and geometry, and interphase mass transfer rate may result in the formation of a high viscosity interfacial layer which can restrict mass transfer. A comparison of experimental and simulated results indicated that processes related to persulfate/NAPL interactions restricted mass transfer, and hence the multi-component mass transfer rate coefficients were ~70 % less than those estimated during an equivalent water flushing period. NAPL interactions can restrict mass loss and chemical oxidation efficiency compared to the no-treatment scenario. Persulfate-NAPL interactions resulted in precipitation and NAPL compositional changes that appear to be the limiting factors.

RÉSUMÉ: Une étude expérimentale et informatique a été conduite afin d'évaluer le rôle de la diffusion dans LPNA (liquide couche interfaciale qui peut limiter les Les masse entre phases entraînent la formation d'une couche interfaciale de forte viscosité. La comparaison des résultats expérimentaux indique que le processus relié aux interactions persulfate/LPNA réduit le transfert de masse et par conséquent, les coefficients de taux de transfert massifs multi-composants étaient 70 % moins -LPNA conduisent à des précipitations et les changements de composition qui se présentent comme les facteurs limitants.

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Cite this article:
Saeid Shafieiyoun; Neil R. Thomson (2017) The role of intra-NAPL diffusion on mass transfer from multi-component NAPLs subjected to persulfate in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper672,author = Saeid Shafieiyoun; Neil R. Thomson,title = The role of intra-NAPL diffusion on mass transfer from multi-component NAPLs subjected to persulfate,year = 2017}